Expansion shield



Nav. 1 C." C. TOMKINSON EXPANSIN SHIELD Filed Auz. 5. 1922 "Patented Nev. a9, 1921.

CHARLES C. TOLKIN'SON, 0F PLAINFIELD, NEW JERSEY,

ASSIGNOR, BY MESNE A S- SIGNMENTS, TO J. EDWARD ,OGDENZ OF MOUNTAINVILLE, NEW YORK.

EXPANSION SHIELD.

Application med August 6, 1922. Serial No. 579,860.

This invention relates to improvements in bolt anchors of the character employed for obtaining anchorages in walls of brick, stone or cementitious material not adapted to di- 5 rectly receive a threaded member.

One of the objects of the invention is to provide an expansion shield so constructed and arranged as to possess superior gripping qualities.

0 Another object of the invention is to provide an expansion shield with a separate member adapted to be used in conjunction therewith to provide excess metal, whereby the gripping action of the shield is increased.

Another object of the invention is to provide an expansion shield having excess 'metal on its outer surface for effecting a secure gripping action upon the expansion of the shield.

Further objects of the invention will appear from the following description taken in connection with the drawings which form a part of this application and in which Fig. 1 is a sectional elevation ofone form of expansion shield constructed in accordance with the invention.

Fig. .2 is a transverse sectional elevation taken substantially on line 2-2 of Fig. 1.

stantially on line 3-'3 of Fig. 1. Y

Fig. 4f is a sectional elevation similar to Fig. 3 but showing a modilied" form of construction.

F ig. 5 is an elevational View illustrating another form of tubular member adapted to be superimposed on a shield shown in Fig. 1 and to provide excess metal on the outer surface thereof.

Fig. 6 is a. view similar to Fig. 5 but showing another form of tubular member.

of tubular members for providing excess metal on the outer surface'of" the shield shown in Fig. 1; and Y Fig. 9 is a sectional elevation showing thecombination of a spiral wound on the outer surface of a shield such as that shown in Fig. 1 with a tubular member superimposed on the spiral. i

The invention may be briefly described as Fig. 3 is a sectional elevation taken sub` Figs. 7 and 8 illustrate still further formscomprising an expansion lshield preferably formed of sheet metal and having superimposed on its outer surface or positioned therewithin a separate member or separate memberfor providing excess metal on the surface of the shield. The invention is not limited to any particular type of shield nor is it limited to any particular form of member for providing excess metal and in the drawings various types of shields yare shown and various forms of members for providing excess metal are illustrated in connection with the different types .of shields.

The shieldl shown in Fig. 1 comprises two sections and 31 one of the sections having tabs 32 overlapping the other section for securing the two sections together. The sec-v tions 31 and 32 are tapered longitudinally to form a constricted -bore and the sections are also corrugated to form screw threads for receiving the bolt to be anchored by the shield. e

For the purpose of providing excess metal a tubular member 33 consisting of a single 'piece of bent material is superimposed on and overlaps the outer surface of the inner or more constricted portion of the shield as shown in Fig. 1. `When the shield is expanded by the bolt the tubular member 33 will also be expanded and will be pressedV -into engagement with the bore of the opening in which the shield .is inserted thereby eii'ecting a iirm and secure gripping engagement with the wall of the opening. -1

ln Fig. 4 the shield 34 is illustrated as consisting of a single piece of bent or rolled material instead of comprising two sections as in theform shown in Figs. 1-3.

vFigs. 5 and 6 illustrate still other forms of tubular members which'may/be usedin conjunction with the shiele'.

Fig. 5- shows a tubular' slits 36 extending from one end longitudi nally thereof to a point adjacent the opposite end. When the member is expanded the slits will. permit the vspreadi/gg; of the portions adjacent thereto. The form shown 1n Fig. 6 is similarto'that shown in Fig. 5

but differs therefrom in. that the tubular member is corrugated as shown' at 37, the

Ashown infFig. 1. member 35 having corrugations 'forming screw threads. by means of which the member may be screwed onto the inner end of the shield.

1n Fig. 7 still another form of tubular member for providing excess metal is illustrated and in this form one end 38 is folded back upon itself, the folded portion extendthe inner end of the shield where the boreis most constricted.

The member shown in Figs. 7 and 8 may be longitudinally slit as shown in Fig. 5 or may be formed from a single piece of material which is bent transversely or rolled into a tube and may expand in the same manner as that shown in Fig. 3.

Fig. 9 shows an expansion shield similar to that shown in Fig. 1 having an elongated spiral 57 threaded thereon and a tubular member 58 superimposed' on the shield and spiral, overlaps them adjacent the inner, orV

more constricted portion of the shield.

From the foregoing specificationy it will be seen that an expansion shield has been provided having its parts so constructed and arranged as to eifect a secure `gripping action. l

Although several different types of shields have been disclosed and although various methods for providing excess metal have been shown, it will be understood by those skilled in the art that the invention isnot limited to the particular embodiments illustrated and described but that further changes in the construction and arrangement of the various cooperating parts may be made without departing from the spirit or scope of the invention as lexpressed in the following claims.l

What I claim is 1. A tapered tubular sheet metal expan- Sion shield comprising a tapered tubular threaded member and a different tubular piece of smooth surfaced metal superimposed.

thereon and formingv a separate thickness of metal on its outer surface engaging the peaksof the thread. f

2. A tapered tubular sheet -metal expansion shield comprising an expansible tapered tubular threaded member and a diiferent tubular piece of smooth surfaced meta-l superimposed thereon and forming a separate thickness of metal on its outer surface engaging the peaks of the thread.

metal longitudinally tapered sectional tubular member having its bore threaded and a separate expansibley tubular member mountn expansion shield comprising a sheety ed thereon at the constricted portion, said member having a smooth surface and engaging the peaks of the thread.

4. An expansion shield comprising a plurality of sections forming a tubular member of uniform thickness, said member being tapered longitudinally to form a constricted bore and having a threaded cross section, and an expansible tubular member consist- .ing of a different piece of smooth surfaced metal encircling the more constricted portion of said first tubular member, and engaging the peaks of the thread to form an additional t ickness of metal.

5. A sheet metal expansion shield comprising a plurality of sections tapered longitudinally to form a constricted bore and corrugated to form screw threads therein,

and a smooth surfaced member superimposed on and engaging the' peaks of the thread on the more' constricted portion of the shield to form an excess of metal.

6. An expansion shield comprising a longitudinallytapered sectional expansible tubular member, having its bore threaded vand an independent expansible sleeve surrounding the sections and having a plurality of expansible portions engaging said thread.

7. .An expansion shield comprising= a tubular member uniform in thickness and hav- A1ing a constricted portion adapted for expansion upon insertion of an expanding element therein, and an independent piece of metal superimposed on the outer surface of the constricted portion of the shield, and encircling the shield'at the constricted portion thereof and extending longitudinally of the shield, said superimposed metal being expansible with the shield.

8. An expansion shield comprising a tu bular member having a constricted portion adapted for 'expansion upon insertion of an expanding element therein, and an independent tube of sheet metal superimposed on the outer surface of the shield and encircling the shield at the constricted portion thereof and extending longitudinally thereof, said superimposed metal being expansible with the shield.

9. An expansion shield comprising a tubular member uniform in thickness having` a larger bore at one end than at the other adapted for expansion upon the insertion of an expanding element therein, and an independent piece of metal superimposed on the outer surface of the smaller part of the shield encircling the shield and extending longitudinally of the shield, said ysuperimposed metalbeing expansible with ,the shield.

- 10. An expansion shield comprising a lurality of sections,"one of said sections aving means for securing' said section to the othersection, and means providing excess metal on the outer surface of the shield.

1,eai,oo4 i 8 A 11. An expansion shield comprising a plumeans for securing said section to the other 'ralitry of sections, one of said sections hav-V section, and means including an annular 10 in means for securing said section to the split band encircling the shield sections for ot er section, and means including an annu- 'providing excess metal on the outer surface 5 lar band providing excess metal on the outer of the shleld. surface of the shield. In witness whereof, I have hereunboset 12. An expansion shield comprising a plu- `my hand this 2nd day of August, 1922. rality of sections, one of said sections having CHARLES. C. TOMKINSW`T 

